Parabola has been a major component of past anniversary blends and is one of our most aggressive offerings. This beer features bold bourbon and tobacco aromas and a rich dark chocolate, charred oak flavor. Parabola is best enjoyed in moderation and is a perfect beer to pair with those chocolate dessert favs. An extension of Quercus Alba —the Firestone Walker Barrel aged program. Russian Imperial Stout Aged in Bourbon Barrels.